CBM和NA49实验中粒子屈服比的逐事件波动
Event-by-event Particle Yield Ratio Fluctuations in the CBM and NA49 Experiments
摘要：
非统计的逐事件波动被认为是QCD相图临界点的重要信号。因此，在目前的实验中，详细研究了不同观测量的逐事件波动。本文首次利用NA 49实验研究了158 AGeV能量的Pb+Pb碰撞中粒子产额比随事件起伏的中心性依赖关系。观察到的动力学波动的绝对值向低中心的增加。将讨论共振衰减的影响。逐事件波动是FAIR未来CBM实验中要研究的重要观测值。CBM将详细研究QCD相图的中间区域，寻找一阶相变线和预期的临界终点。因此，重要的是调查的CBM探测器的灵敏度在10-45 AGeV的光束能量的Au+Au碰撞的粒子比波动。将提出详细的模拟研究。
英文摘要：
Non-statistical event-by-event fluctuations are considered an important signal for the critical endpoint of the QCD phase diagram. Event-by-event fluctuations of different observables are thus investigated in detail in current experiments. In this contribution, a study of the centrality dependence of event-by-event fluctuations of particle yield ratios by the NA49 experiment in Pb+Pb collisions at 158A GeV beam energy is presented for the first time. An increase of the absolute values of dynamical fluctuations towards lower centralities is observed. The influence of resonance decays will be discussed. Event-by-event fluctuations are an important observable to be studied at the future CBM experiment at FAIR. CBM will investigate the intermediate region of the QCD phase diagram in great detail searching for the first order phase transition line and the expected critical endpoint. It is therefore important to investigate the sensitivity of the CBM detector to particle ratio fluctuations in Au+Au collisions at 10-45 AGeV beam energy. Detailed simulation studies will be presented.
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